Radio shielded cable fastener



Patented Ang. 14, 1934 uNflrEu srATE-s PATENT oFFica 1,969,866 RADIO SHIELDED CABLE EASTENER Application July 8, 1933, Serial No. 679,470

2 Claims.

Our invention relates to improvements in cable fasteners; and particularly to yn fastener for a cable with a radio shield enveloping the same and intended for use in high tension circuits.

An. object ci the invention. is to provide a cable designed to be securely attached to the high tension terminal of an ignition coil for an internal combustion engine, in such a manner that the connection to the cable is effectually maintained and the radio shield of said cable can be properly grounded.

The foregoing and other objects and advantages of the invention will be apparent from the iollowing description, in which the preferred form of our invention is disclosed. But we, of course, reserve the right to make any changes which do not depart from the principle of the invention or exceed the scope and spirit of the appended claims. l

On the drawing:

Fig. 1 is a side view partly in section of a radio shielded cable with the fastener element thereon; and

Fig. 2 shows in section the upper part of the casing of an ignition coil with such a cable secured to the high tension terminal thereof.

On the drawing the same numerals identify the same parts throughout.

The cable comprises a conductor or wire 1 cov- 2 and enveloping the insula tion 2 is a sleeve of conducting material which may be formed oiwoven metallic strips 3. Over the radio shield is a tubular sleeve or cover of cloth 4. Adjacent one end oi this conductor is a 5 ierrule 5 having a flange 6. The ierrule envelops the adjacent end of the cloth covering 4 and this ierrule is counterbored within the flange 6 so that the adjacent extremi y of the tubular radio shield 3 can be expanded. Within the flanged end of the ferrule is forced a lead washer 7 which snugly encircles the insulation 2 and clamps the adjacent expanded end of the shield 3 between it and the inside surface of the -flange 6. The radio shield is thus securely fastened to the 45 ierrule and electrically connected thereto. The

wad washer l can easily be forced into the flanged end of the ferrule and caused to grip the adjacent end oi the' shield 3 between it and the ferrule without any risk of damaging the shield; and it will always hold the end of the shield in firm engagement with the ierrule so as to maintain the electrical connection of the shield therewith. p

The upper part of the casing b5 shown at 8 and the coil therein,

of the coil is which is not oi hard rubber.

lhigh tension cable is (Cl. TNF-269) illustrated, will carry at the upper end thereof insulation 9 in which is embedded a terminal 10 connected to the high tension end of the secondary oi. the coil. The-terminal 10 will make contact with a cuphaped element 11 which has a threaded opening 12 therein; and in this open- 60 ing is screwed one end oi' a tubular member 13. Engaging the other* end of the hollow member 13 is a hollow insulating sleeve 14 which may be The insulation 9 has a neck or bcss15 which surrounds the element 11, member 6 13 and sleeve 14 and at the bottom of which the terminal 10 is exposed. The sleeve 14 has a bore therethrough from one end to the other, the bore being threaded at one end to engage the member 13 and counterbored at the opposite nd to pro- 7 vide a seat for a conical washer 16 which may be soft rubber to form a cushion upon which the flanged ferrule 5 may rest. The conductor 1 is connected to the coil in the casing 8 by inserting the extremity thereof covered with insulation 2 75 beyond the ilange 6 into the washer 16 and forcing said extremity into the bore of the sleeve 14 so that the end of the conductor 1 will enter the bore through the contact member 13. Thus the conductor 1 will be electrically connected' to the terminal 10. A sleeve nut 17 having an opening for the ferrule 5 screws upon a threaded neck 18 at the top of the casing and clamps the flange 6 of the ferrule 5 against the washer 16 which acts as a packing or gasket between the ferrule and the sleeve 14. The points where the terminals of the primary or low tension windings of the coil of the casing 8 arel located are indicated at 19 and connection therewith may be made through bushings indicated on the easing a at 2o. 9

The utility of this method of fastening the cable to an ignition coil will now be apparent. The cap nut 17 and the washer '16 gripthe flange 6 of the ferrule 5 securely between them and the thus held in place and its 95 connection with the high tension terminal 10 of the coil is maintained under all conditions in practice. The cable cannot be shaken loose and the connection between the cable and the' terminal 10 is prooi against leakage of .moisture or the entrance of dust and dirt and other foreign substances which might cause corrosion and faulty connection. At the same time the lead washer 7 maintains electrical connection between the ier- 105 rule and the shield 3 and through the cap nut 17 the shield 3 is connected to the casing 8 and therefrom to ground. The element 7 is tightly seated in the ferrule 5 but on account of the softness of the lead in this washer there is no risk n0 or damage to the radio shield when this washer is forced in place to grip the shield between the washer and the inside oi' the iiange 8.

The insulation 2, shield 3 and cloth cover 4 extend along the conductor 1 away from the casing 8 to the other extremity oi' the only `a short length of these parts is shown in Figs. 1 and 2. 'Ihe shield 3 terminates at the i'en'ule 5 but the conductor 1 and insulation 2 extend beyond the ange 6 as far as necessary to enter the sleeve 14 and member 13, as illustrated in Fig. 2, to make connection with the terminal 1,0 through the conductor element 11.

Having described the invention, what is claimed cable, although 1. A cable connector comprising a conducting element, a hollow member secured thereto. a sleeve also secured to said member, a cushion upon said sleeve, a cable comprising a conductor with an insulating covering having its vextremity in said sleeve and engaging said member, a ierrule on said cable compressing said cushion between said Lacasse and means engaging the latter securely against said rule together, an element and a hollow conducting member having screw threaded engagement therewith, a' sleeve attached to said conducting member, a perforated cushioning washer at one end oi the sleeve, inserted through said washer into said sleeve to make Contact "with said member, and means comprising a cap nut surrounding 'the cable and holding the ierrule against said cushioning wash- JULUS E. '9i/ILD. WOLFGANG E. SCHWARZMANN.

the cable having its extremity 

